Novell LINUX ENTERPRISE SERVER 10 SP2 - STORAGE ADMINISTRATION GUIDE 05-15-2009 Administration Manual page 62

Multipath Attribute
path_checker
path_selector
pg_timeout
62 SLES 10 SP2: Storage Administration Guide
Description
Determines the state of the
path.
Specifies the path-selector
algorithm to use for load-
balancing.
Specifies path group timeout
handling.
Values
directio (Default in
multipath-tools
0.4.8 and later) Reads the first sector that has
direct I/O. This is useful for DASD devices. Logs
failure messages in
/var/log/messages
readsector0 (Default in multipath-tools
version 0.4.7 and earlier) Reads the first sector
of the device. Logs failure messages in
log/messages .
tur Issues a SCSI test unit ready command to
the device. This is the preferred setting if the
LUN supports it. The command does not fill up
var/log/messages on failure with messages.
Some SAN vendors provide custom
options:
path_checker
emc_clariion Queries the EMC Clariion
EVPD page 0xC0 to determine the path
state.
hp_sw Checks the path state (Up, Down, or
Ghost) for HP storage arrays with Active/
Standby firmware.
Checks the path state for the LSI/
rdac
Engenio RDAC storage controller.
round-robin 0 (Default) The load-balancing
algorithm used to balance traffic across all active
paths in a priority group.
This is currently the only algorithm available.
NONE (internal default)
version
.
/var/
/